Bokeh, the smoothness and gradation of out-of-focus backgrounds, is harder to achieve with wide angle lenses ... 4 onwards is very acceptable for a 24mm lens.
Sharpness is very good at f/1.8, excellent from f/2 to f/11 and very good at f/16. The edges are good throughout, rising to very good at f/4. The blue column represents readings from the centre of ...